66640766412 has 24 divisors (see below), whose sum is σ = 169631042112. Its totient is φ = 20194171600.

The previous prime is 66640766399. The next prime is 66640766417. The reversal of 66640766412 is 21466704666.

It is not an unprimeable number, because it can be changed into a prime (66640766417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252427014 + ... + 252427277.

It is an arithmetic number, because the mean of its divisors is an integer number (7067960088).

Almost surely, 2^66640766412 is an apocalyptic number.

It is an amenable number.

66640766412 is an abundant number, since it is smaller than the sum of its proper divisors (102990275700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66640766412 is a wasteful number, since it uses less digits than its factorization.

66640766412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504854309 (or 504854307 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 48.

The spelling of 66640766412 in words is "sixty-six billion, six hundred forty million, seven hundred sixty-six thousand, four hundred twelve".